During the pressure hull manufacturing, processes like cold bending and welding are often applied. These processes lead to permanent plastic deformations which are associated with residual stresses. The presence of residual stresses is equivalent to the introduction of an initial preload in the structure, which accelerates the plastification process, decreasing pressure hull resistance. To quantify this reduction, a case study that considers residual stresses due to cold bending on hull plates and frame flanges had been performed using finite element models. The study encompasses hull diameters of 6, 8, and 10 m with hull plates and frame flange thickness from 20 to 30 mm, with HY100 steel. Finite element numerical analyses were done considering material and geometric nonlinearities. First, the cold bending residual stresses were determined using finite element models. Then, these cold bending residual stresses were introduced as initial stresses in the submarine pressure hulls' finite element models. In the end, it was possible to verify that the presence of cold bending residual stress reduces the submarine hull collapse pressure up to 4.3%.
Finite Element Cold Bending Residual Stress Evaluation on Submarine Pressure Hull Instability Assessment
Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received January 16, 2016; final manuscript received June 27, 2016; published online July 29, 2016. Editor: Solomon Yim.
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Rogério Franquetto, P., and Mattar Neto, M. (July 29, 2016). "Finite Element Cold Bending Residual Stress Evaluation on Submarine Pressure Hull Instability Assessment." ASME. J. Offshore Mech. Arct. Eng. December 2016; 138(6): 061101. https://doi.org/10.1115/1.4034076
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